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. 2018 May 15;9:635. doi: 10.3389/fpls.2018.00635

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Copyright © 2018 Wu, Jin, Liao, Hu, Dawuda, Zhao, Tang, Gong and Yu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Regulation manners among ALA metabolic pathway of cucumber under NaCl stress. The metabolic pathway downstream of ALA in higher plants can mainly fall into Fe-branch and Mg-branch, for heme biosynthesis and chlorophyll biosynthesis, respectively. Results showed that (1) Fe-branch was enhanced under salt stress to form more heme, this could be conjectured as an adaptive or against response in plants; (2) The accumulation of heme under stress condition feed-back inhibited the biosynthesis and metabolic of endogenous ALA; (3) Application of exogenous ALA under stress enhanced the Mg-branch to produce more chlorophyll and kept the Fe-branch enhanced at the same time.